Following function works as .m file but does not produce any output as function file

Hello,

The following code works prefectly when run as .m file but when I want to use it as a function its output is empty!

function timespan= timesep(begtime,endtime,stinterval,btinterval,sindent,bindent)

% clearvars
% begtime=0;
% endtime=115;%
% stinterval = 5;%
% btinterval=20;%
% sindent = 1;%
% bindent = 5;%

time_span = [begtime]; end_span = 0;
for iter = 1:fix(endtime/btinterval)
    timing = [end_span+begtime+sindent:sindent:end_span+stinterval end_span+stinterval+bindent:bindent:end_span+btinterval]';
    time_span = [time_span; timing]; % (1:end-1)

      end_span = iter*btinterval;

end
if mod(endtime,btinterval)
    timing = [end_span+begtime+sindent:sindent:end_span+stinterval end_span+stinterval+bindent:bindent:endtime]';
    time_span = [time_span; timing];
end
timespan = time_span;
end

To use it as function I run

 tspan=timesep(0,200,1,5,5,20);

but tspan is empty!

Explanation of what the code does: It takes a range and divide it to different intervals. however the intervals are smaller at specific ranges and bigger at the rest. This is like having different time-steps when solving a numerical problem where at some points due to numerical instabilities time-steps should be very small, but at other points can be big to increase the computational speed.

[CS Researcher]

Give it the same values as you give to your script and then compare.

tspan = timesep(0, 200, 5, 60, 0.0001, 0.01)

[Mehdi Gh]

There is basically no difference between the two examples. I specially solved the easier case, to see if the code does what it is supposed to. I now changed the values in code to what it is for executing function at command line.

I guess there is something related to calling or retrieving a value from a function which I am not doing correct here. The code runs correctly and generates what I need as .m file, but not as a function file!

[Walter Roberson]

Mehdi Gh comments "Thank you. you were right. the order in my function call was wrong!"

Answer 1

[Walter Roberson]

Your intervals are too small. In

timing = [end_span+begtime+sindent:sindent:end_span+stinterval end_span+stinterval+bindent:bindent:end_span+btinterval]';

begtime+sident > stinterval and stinterval+bindent > btinterval so no matter how far along you shift the end_span, the end point is before the beginning point and so the interval is empty.

[Mehdi Gh]

This code works perfectly when I comment the first and the last line (basically change it from function to a .m file) and un-comment lines 3-9. I get what I need there in timespan variable, no problem in it. The problem emerges when I change it to function and call it from the command line. I'm not then able to get that variable (timespan) as the output of function!

[Mehdi Gh]

example=timesep(0,115,5,20,1,5);

was the correct way to call the function. I just noticed that I put them in a wrong order when calling the function! Thank you for the help :)

Answer 2

[Stalin Samuel]

The input parameters highly influence the output.So try with different input values .then you can understand the exact issue.